What are the alternatives to OpenPGP that I can start using today?
this post was submitted on 12 May 2022
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Privacy
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Very good question. Thank you for asking.
To sign documents, I would recommend using signify or minisign.
To encrypt files, I guess one could use age
If you need a cryptolibrary, I would recommend nacl or sodium. In Go, I use nacl a lot. If you need to encrypt or sign very large files, I wrote a small library based on nacl.
Emails are the tricky part. It really depends on your workflow. When I was working for a gov infosec agency, we learned to never use any integrated email crypto solution. Save the blob, decrypt the blob in a secure environment. This helps significantly against leaks and against creating an oracle to the attacker's benefit.
For data containers, I would use dm-crypt and dm-verity + a signed root. But that's just me and I would probably not recommend this to other people :)
OpenPGP is rarely used in messaging protocols, but if it was I would probably advise leveraging a double ratchet library.
One example of issues with OpenPGP implementations that are a direct consequence of the poor format desgin... https://www.ssi.gouv.fr/uploads/2015/05/format-Oracles-on-OpenPGP.pdf